Dislocation networks in gamma/gamma'-microstructures formed during selective laser melting of a Ni-base superalloy. (1st January 2021)

• Record Type: Journal Article
• Authors: Heep, L.; Schwalbe, C.; Heinze, C.; Dlouhy, A.; Rae, C.M.F.; Eggeler, G.
• Is Part Of: Scripta materialia. Number 190(2021)
• Page Start: 121
• Page End: 125
• Publication Date: 2021-01-01
• Subjects: Dislocation networks -- Ni-base superalloys -- Merging γ'-particles -- Scanning transmission electron microscopy -- Anti-phase boundary energies; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.08.019
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A dislocation network which formed during selective laser melting (SLM) of a Ni-base superalloy was analyzed using scanning transmission electron microscopy (STEM). This network traverses an ordered Gamma'-phase domain, in between two adjacent Gamma-solid solution regions. The Gamma'-phase region has formed when two Gamma'-phase particles have started to coalesce, trapping the dislocation network in this ordered region so that it formed two dislocation families with pairs of anti-phase boundary (APB) coupled super partial dislocations. The network features are presented and unusual features (twist character and low APB energies), not previously reported, are discussed. Graphical abstract: Image, graphical abstract